Hydraulic motor for wagon-dumps.



J. E. CAMP. HYDRAULIC MOTOR FOR WAGON DUMPS.

APPLIOATION FILED APR. 27,1906.

Patented Jan. 12, 1909.

I INVENTUR @ep IZ iz/V774 UNITED STATES PATENT OFFICE.

JOSEPH E. CAMP, OF WASHINGTON, ILLINOIS, ASSIGNO R TO CAMP BROS. & (30., OF METAMORA,

ILLINOIS,-A CORPORATION ILLINOIS.

HYDRAULIC MOTOR FOR WAGON-DUMPS.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed April 27, 1906. Serial No. 314,012.

Illinois, have invented certain new and useful Improvements in Hydraulic Motors for Wagon-Dumps; and I do hereby declare that the following is a full, clear; and exact description-of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention pertains to improvements in wagon dumps, and relates more particularly to a dump in which hydraulic means is used for raising the wagon.

The object of the present invention is to provide an hydraulic cylinder -whose piston is adapted to descend for the purpose of raising the wagon through overhead ro es.

A further object is to provide an ydraulic device for raising a wagon; the piston of which is adapted to descend instead of ascend as in other forms of this machine forming the subject of previous applications of mine in this line of devices. a

A further obj ect of the invention is to provide an overhead derrick beneath whichthe loaded wagon is driven, said derrick having at one end an hydraulic means for elevating the wagon through ropes depending from such derrick. 1

A further object lies in the employment of a valve carried by the piston and opened automatically the end of its travel so as to-au-tomatically relieve the pressure which operates said pis- The invention also relates to certain details of construction and arrangement of parts as will be ointed out in the following description and in the accom anying claims.

In the appended drawing, igure 1 is a perspective view of'my invention. Fig. 2 1s a vertical section of a cylinder and fluid tank and the connection therebetween. Fig. 3 is a vertical section of a portion of the lower end of the cylinder showing a relief valve in the piston also shown within the cylinder. Fig. 4 is a horizontal section of thevalve shown in Fi 3.

A indicates two vertical frames of a derrick which carry at their. tops a horizontal beam B having two pulle s C C suspended.

therefrom by suitable mem ers such as D D. At one end of the derrick is a platform E hav- -ried on the at the time'the 'piston reaches ing mounted thereon a vertical cylinder F having therein a 1piston and piston rod G and H res ectively, ig. 2. Immediately above the cy inder beneath the beam B of the derrick are suspended two pulleys J over each of.-

which runs a rope K one of which extends to and .over the: adjacent pulley C before described. The other rope extends to and over the remaining pulley O. {The ends of the ropes just above the cylinderare suitably attached to the piston rod while-the ends which are suspended from .the pulleys C are'e'ach providedwith a loop for engaging the hubs of the wagon wheels; the entire "device as de scribed bein readily portable in the same manner as other apparatus of its-class.

At M is a fluid tank preferablyabove the cylinder. nected through a pipe N with a pump 0 car- 'latform E. Said ump is mounted on mem ers P secured to t -e platform and is adapted to oscillate between said members to accommodate itself to the movements of its piston rodQoperated by an eccentric S on a shaft-T,- said piston rod having an eccentricstrap R which" surrounds said eccentric. The shaft Tiscarried in b'earin s U on the platform and is driven from t e elevator (not shown) through .a belt V and pulley W. I have not shown details of the pump-since a device of this kind is wellunderstood. Connected intothe pump is one end ofa pipe 2 also connected at its other end into the top'of the cylinder .F. as shown in Fig. 2. A pipe 3 connects the' bottom of the' cy inder with the top of thetank M and a shortfpipe at 4 connects said pipe 3 with the to of the cylinder as wellgthere being a cut-o 'valve 5 in said pipe-4 operated by means of a"- leve r 6 and a pull-rod 7. 3

In'Fig. 3 the piston G of the cylinder F is illustrated in part section inorder' to show a relief valve G the stem Gtof whichoccupies a bore G in said piston. Said bore terminates in the upper surface ofth-e piston in a conical seat G in which the head G- is adapted to seat. vided with a pin at G and between said pin and the under surface of the piston is a s ring G for normally holding the said head & in its said seat G.

In the operation of raising the wagon the piston, in order to raise the-loops L, must .descend and in order to cause this action a fluid, preferably oil, is pumped into the top The bottom of said tank-is con-' The valve thus constituted is proa I of the cylinder through the pipe 2 by means of the pump 0 the sup ly being received from the tank M through tl ie pipe N said tank bein part ofthe pipe system and serving to ho d the oil displaced by the iston-rod H,it being obvious that the cylinder holds less oil when the piston-rod is positioned therein than when it is outside.

A check valve 1 is placed in thelatter pipe so that the oil can only pass in onedirection, that is, from the tank M to the pump. A similar valve 8 is also placed in the pipe 2 so that ressure can pass toward the cylinder F ut not in the contrary. direction. It will be understood that the pressure within the cylinder will force the piston down thus drawing upon the ropes' In K the loops of which will be raised. In order to have the raising movement of the wagon under periect control I provide the cut-off valve 5 and the pipe 3 hereinbefore described. Since by opening the said valve a passage will be opened from tank M the oil under pressure in the former will esca e to said tank as it is forced into the vcylinder by the pump. The amountof pressure admitted through the valve 5 will govern the rate of travel of the piston and the wider said valve is opened the slower the piston will travel until a point is reached where the weight of the wagon is balanced by the pressure and the piston is held stationary, the balance of pressure returning to the pump. If, however, the valve be opened wide the oil in the cylinder will be allowed to pass therethrough to the tank M by the raising movement of the piston due to the weight of the wagon sus ended from the ropes K K. In this way t e wagon is lowered after being relieved of its load, the iston remaining at the top of the cylinder as ong as the valve is left open since if the pump is continually in motlon the oil entering the cylinder will pass at once through said valve to the said tank.

My device is automatic in its action in that after the wagon has been raised to its full hei ht, 'i. 2. when the iston is at the bottom of tie cylinder the oil eing continuously entered to the latter is given a path back to the tank M from which it is drawn. The means for admitting of this action is the valve G hereinbeiore described. It will be noted that the stem of this valve extends some distance below the lower "face of the piston and as the latter a proaches the bottom of the cylinder the sai stem contacts with the said bottom as the piston continues to descend, thereby carrying its conical seat Gr away from beneath the said valve. The oil is thus given a small outlet and passes down through the bore G3 and thence into the pipe 3 as indicated b the arrow in Fig. 3.. It is to be 'noted t at the stem of the valve is in the form of a cross there being spaces between the limbs thereof through which the oil can the top of the cylinder to the being perfectly automatic.

pass. It is evident that the oil in being put under pressure will force the piston down until the valve G is opened as described at which time the pressure is relieved just enough to revent overwork on the pump and yet hold the piston stationary as long as it is desired that the wagon should remain in" the'raised position. Evidently the opening of the valve'5 at any time will allow speedy escape of the oil which may either pass to the tank M or descend through the pipe 3 and enter the cylinder beneath the. piston. It is quite evident that in order to let the piston rise oil must be allowed-to enter beneath it from above the piston through the valve 5.

Then-after the piston has reachedthe top of ow the cylinder an the latter is full of oil be said piston, the pipe 3 being also ful the oil still entering on top of the piston from the pump will pass the valve 5 and reach the tank M. When the valve 5 is closed the piston is made to descend as described, the oil thereunder then passing to said tank M.

"Means may be employed, of course, for i stopping the pump, if desired, instead of permitting it to run continuously but in using the apparatus as described and shown the operator uses but the one valve 5. The .operation is, therefore, very simple the device In other devices of this character the piston is forced upward by pressure to raise a wagon but in the present case the iston is forced downward to accomplish t e same end. Further than this I have provided the automatic relief valve in the piston which I regard as new in devices of this character. The arrangement is quite simple in construction by reason of having the automatic relief valve and it is, of course, ossible to use said valve on the istons whic move upward as well by simp y reversing its position in said piston.

I am a prised of a hoisting device wherein a vertica cylinder is used which has pressure entered at its top to force the piston down, the latter havin connection w1th a suitable raising tackle. But in this patent the pressure is relieved through the same pipe by which it is entered to the cylinder. Moreover, the device is of such a nature that it cannot be transported from place to place as is necessary in a wagon dump. The construction in the present application is comact and can therefore be readily moved from lace to place if desiredf:

I c aim 1. In an apparatus of the class descr'bed, a fluid pressure cylinder and its piston and piston-rod, in combination with a system for holding fluid, including a continuously acting ump for producing a continuous and uniiorm pressure at all times, means for continuously operating said pumpto roduce said uniform pressure a fluid conduit connecting the pump with one end of the cylinder, a

- fluid receiving vessel forming part of said conduit, a check valve in said conduit to give flow only toward the pump, a second fluid conduit connected-to the first outside the pump between the check v'alve and the cylinder and connected with the latter at the end opposite that to which the first conduit is connected, a manually operated valve in named conduit with the top of the cylinder,

a manually operated valve therein, a conduit connecting the pump with the top of the cylinder, and a check valve therein.

3. In a hydraulic jack, a cylinder and its piston, a pump, a fluid receiving vessel, a conduit connecting the pump and vessel, a check valve therein, a conduit connected with the vessel and also with .the bottom of the cylinder, a conduit connecting the last named conduit with the-top of the cylinder, a

manually operated valve therein, a conduitconnecting the pump with the top of the cylinder, a check valve therein, and a valve in the piston of said cylinder for the purposes set forth.

i. A cylinder and its piston, a device for continuously pumping fluid, a pipe connecting it with the top of the cylinder, a check valve in the pipe for permitting passage of fluid only in the direction of the cylinder, a liuid receiving vessel, a pipe connecting the fluid vessel with the opposite side of the pump, a check-valve therein for permitting passage of fluid only in the direction of the pump whereby the fluid is drawn from said .vessel and entered into the cylinder upon the piston, a valve in the said iston adapted to contact with the bottom of the cylinder and automatically open. against the pressure of. fluid behind it to relieve said pressure when the piston has reached its lowest position, a pipe connecting the bottom of the cylinder with the said fluid vessel whereby the pressure passed through said valve is returned to said vessel, the escaping fluid relieving part of the pressure of the pump, the remaining pressure holding the piston depressed.

'5. A cyliI der and its piston a device for continuously pumping fluid, a pipe connectin it with the top of the cylinder, a check va ve in the pipe for permitting passage of fluid to the cylindervbut not in the opposite direction, a fluid receiving vessel, a pipe connecting the fluid vessel with the opposite side of the pump, a check valve therein for permitting passage of fluid only in the direction of the pump whereby the fluid" is drawn from said vesseland entered into the cylinder upon the piston, a valve in the said piston ada ted to connect with the bottom of the cy indr and automatically open against the pressure of fluid behind it to relieve said pressure when the piston has reached its lowest position, apipe connecting the bottom of the cylinder with the said fluid vessel whereby the pressure passed through said automatic valve'is returned to said vessel, the escaping fluid relieving part of the 1pressure of the pump, the remaining pressure olding the piston depressed, a pipe con necting the top of the cylinder with the pressure-relief pipe and a valve therein, the opening of which permits the discharge of the fluid from above the piston to the bottom of the cylinder beneath said tially as set forth. V.

In testimony whereof I affix my signature, in presence of two Witnesses. JOSEPH E. CAMP. Witnesses: I i

J. O. IRVING, C. W. CAMP.

piston substan- 

